- #1
iamsmooth
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Homework Statement
Prove that asquare matrix A is invertible if nad only if ATA is invertible
Homework Equations
Hmm, can't think of any. A A-1 = I maybe?
The Attempt at a Solution
I have trouble with these theory questions, so I'm not sure how to approach this.
If something is invertible, that means it's determinant is not 0? So does it have something to do with that?
Thanks